Failed to load from modal dialog, window.showModalDialog

Question

I cannot download a file from an aspx page if the aspx page is open in a modal popup using window.showModalDialog ().

I have an image button on an aspx page that I clicked on which an Excel file was generated using some business logic, and then I add it to the Response header to make this file available for download. The code is shown below.

Protected Sub ibtnExport_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles ibtnExport.Click
    ...
    Some business logic to generate excel file.
    ...

    Response.ClearHeaders()

    Response.ContentType = "application/ms-excel"
    Response.AddHeader("content-disposition", "attachment; filename=" + someXLSFile )
    Response.TransmitFile(someXLSFileWithPath)
    Response.Flush()
    HttpContext.Current.ApplicationInstance.CompleteRequest()

End Sub

When I open this aspx page as a modal popup, it does not show the browser loading window. In the case of a normal (weak, open using window.open) popup, it works fine.

. , ibtnExport_Click, aspx, Download.aspx, window.open Download.aspx. ,

Protected Sub ibtnExport_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles ibtnExport.Click
    ...
    Some business logic to generate excel file.
    ...

    Session("$FileToDownload$") = someXLSFileWithPath    
    ClientScript.RegisterStartupScript(GetType(String),"download","window.open('Download.aspx')",true)

End Sub

Download.aspx,

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    Dim filetoDownload As String = CType(Session("$FileToDownload$"), String)
    Dim fileName As String = System.IO.Path.GetFileName(filetoDownload)

    Response.ClearHeaders()
    Response.ContentType = "application/ms-excel"
    Response.AddHeader("content-disposition", "attachment; filename=" + fileName)
    Response.TransmitFile(filetoDownload)
    Response.Flush()
    HttpContext.Current.ApplicationInstance.CompleteRequest()        
End Sub

, , relife, IIS:). , ASP.NET, IIS.

?

Answer 1

. .ashx . .

:

Sub DownloadFile()

    'use the ashx handler file to download the file
    Response.Redirect("~/Dispatch/ProofOfDeliveryDocs.ashx?id=" & lstDocuments.SelectedValue)

End Sub

ProofOfDeliveryDocs.ashx, Response():

( doc.DocumentName , , )

Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest

    Dim doc As DeliveryDoc = New DeliveryDoc

    If Not context.Request.QueryString("id") = Nothing Then

        doc = doc.GetDeliveryDoc(context.Request.QueryString("id")) 'get the file

        context.Response.Clear()
        context.Response.ContentType = "application/x-unknown"
        context.Response.AppendHeader("Content-Disposition", "attachment; filename=" & doc.DocumentName)
        context.Response.BinaryWrite(doc.FileData.ToArray)

    End If

End Sub

VB, #, . , !